Automatic four-wheel drive transfer case

Details Automatic four-wheel drive transfer case Automatic four-wheel drive transfer case

1979-11-15

1981-11-03

Peters, Jr., Joseph F.

Motor vehicles

Having four wheels driven

With manually operated means for disengaging drive to one or...

74711, 180249, B60K 1734, F16H 3706, F16H 144

Patent

active

042980852

ABSTRACT:
An automatic four-wheel drive transfer case according to this invention comprises a differential gear connected to the output shaft of a transmission, said differential gear having first and second side gears and a casing, a clutch arranged coaxially with the output shaft for releasably engaging the casing of the differential gear with the side gears thereof, the first side gear being connected with a rearwheel drive output shaft which is arranged on the extension of the output shaft of the transmission, the second side gear being connected with an intermediate shaft arranged coaxially with the output shaft of the transmission, a selective gearing for selectively engaging the second side gear with a front-wheel drive output shaft to change over between two-wheel drive and four-wheel drive, and a clutch control which receives a signal indicating the position of the selective gearing and signals representing the revolution speed of the front-wheel drive output shaft and/or the rear-wheel drive output shaft so as to selectively control the operation of the clutch, whereby the clutch control engages the clutch in two-wheel drive, and in four-wheel drive it engages the clutch when the vehicle speed is below a predetermined level or when the difference in the revolution speed between the front- and rear-wheel drive output shafts is greater than a predetermined value.

REFERENCES:
patent: 3627072 (1971-12-01), Smirl
patent: 3650349 (1972-03-01), Cleveland et al.
patent: 3748928 (1973-07-01), Shiber
patent: 3845671 (1974-11-01), Sharp et al.
patent: 3955442 (1976-05-01), Kessmar

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